Explore light & color with James Block Set! This set includes 10 translucent windows and 10 lucite gemstones, perfect for adding to existing block sets such as Riley, Austin, or the Barca sets. With these blocks, children can practice counting, stacking, sorting, and exploring colors. Use them with a light table or natural light from a window to see the beautiful shadows they create. This versatile set fosters creativity, STEM learning, and fine-motor skills in children ages 3 and up. Whether at home, in school, or at daycare, these open-ended toys will provide endless possibilities for play and learning. Wooden blocks are unpainted and unvarnished Beech Wood. Lucite blocks are acrylic. Packaged in a beautiful wooden tray for easy storage.